Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Walters, Donald L.; Luscher, Darby J.; Yeager, John D.

doi:10.1063/1.5044840

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…Researchers also applied X-ray computed tomography (CT) technology to study the internal structure characteristics and defects of PBXs. These include microstructure changes under indirect tensile stress [14], pore changes under thermal cycling [15], microstructure fracture behavior under compression [16], interface damage and healing behavior between explosive particles and binders [17], etc. Although CT techniques have been widely used in mesoscale experimental studies of PBXs, it is difficult to quantitatively characterize the internal deformation and damage distribution of PBXs by CT techniques alone [18,19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Localized Deformation and Damage Behavior of Polymer-Bonded Explosive Simulant under Cyclic Compression

Jia,

Hao,

Peng

et al. 2024

Materials

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Uniaxial cyclic compression tests were performed to investigate the compression deformation and damage of polymer-bonded explosive (PBX) simulant, particularly shear localization. The macroscopic mechanical behavior and mesoscale failure mechanisms of the PBX simulant were analyzed by optical observation and SEM scanning methods. After each cyclic compression, the specimen was scanned by X-ray computed tomography (CT), and the internal 3D deformation of the specimen was calculated using the digital volume correlation (DVC) method. The results show that the stress–strain curve of the PBX simulant exhibits five stages and coincides with the morphological changes on the surface of the specimen. The mesoscale failure mechanism is dominated by particle interface debonding and binder tearing, accompanied by a small amount of particle breakage. There are three bifurcation points (T1, T2, and T3) in the curves of the normal and shear strain components with compression strain. It was found that these bifurcation points can reflect the full progression of the specimen from inconspicuous damage to uniformly distributed damage, shear localization, and eventual macroscopic fracture. The strain invariant I1 can quantitatively and completely characterize the deformation and damage processes of the PBX simulant under cyclic compression.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Localized Deformation and Damage Behavior of Polymer-Bonded Explosive Simulant under Cyclic Compression

Jia,

Hao,

Peng

et al. 2024

Materials

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The Wormholes Within: A Study of 1, 3, 5‐Triamino‐2, 4, 6‐Trinitrobenzene Crystal Morphology by Micro and Nano‐Scale X‐Ray Computed Tomography and its Effects Upon the Shock Sensitivity of Detonation

Kuettner

Henderson

Yeager

et al. 2022

Propellants Explo Pyrotec

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We understand heterogeneous‐explosive detonation only to the extent that we can first measure the salient chemical and microstructural features. Barring an inordinate amount of trial and error, we can tailor the detonation properties of our HE formulations only to the extent that we understand (at least qualitatively) the same effects. As an insensitive high explosive, 1, 3, 5‐triamino‐2, 4, 6‐trinitrobenzene (TATB) burns more heterogeneously than conventional high explosives, making its detonation properties sensitive to microstructure. The Benziger route can produce various grain morphologies depending on the amount of water used in the amination step. So‐called dry‐aminated (DA) TATB crystals are riddled with a void structure called wormholes, which are washed out ammonium chloride (NH4Cl) inclusions that form during synthesis. So‐called wet‐aminated (WA) TATB crystals do not contain NH4Cl inclusions but possess a very convoluted external structure. Using both micro and nano‐scale CT, we explore three DA‐TATB lots that reflect evolutionary processing changes, plus one WA‐TATB material. Micro CT imaged crystal collections show the exterior grain structure, revealing its roughness and providing a crude particle size measurement. The DA‐TATB lots that test most sensitively in the LANL ECOT corner‐turning test are roughest, having the appearance of being “corroded”. Nano‐scale CT reveals both internal NH4Cl inclusions and void structures. The DA‐TATB lots that tested intermediate and high sensitivity in ECOT exhibited similar wormhole structures, which were more extensive than that of the low‐sensitivity lot. The least sensitive DA‐TATB lot also retained more NH4Cl, consistent with reduced connectivity of voids to the surface.

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Material and morphology parameter sensitivity analysis in particulate composite materials

Zhang

Oskay

2017

Comput Mech

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Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Cited by 5 publications

References 24 publications

Experimental Study on the Localized Deformation and Damage Behavior of Polymer-Bonded Explosive Simulant under Cyclic Compression

Experimental Study on the Localized Deformation and Damage Behavior of Polymer-Bonded Explosive Simulant under Cyclic Compression

The Wormholes Within: A Study of 1, 3, 5‐Triamino‐2, 4, 6‐Trinitrobenzene Crystal Morphology by Micro and Nano‐Scale X‐Ray Computed Tomography and its Effects Upon the Shock Sensitivity of Detonation

Material and morphology parameter sensitivity analysis in particulate composite materials

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